D353 INDUSTRIAL ENGINE Caterpillar

Fuel System

Usage:

Fuel

Check the fuel supply. Order fuel as required. See Lubrication and Maintenance Chart for fuel recommendations.

Fuel Tank

Filling

Fill the day tank at the end of each day's operation. This helps prevent moisture in the air from condensing on the inside walls of the tank and contaminating the fuel with water.

Draining Water And Sediment

1. Open the fuel tank drain valve and drain water and sediment from fuel tank.

2. Close the drain valve.

Fuel Filters

Checking Fuel Pressure Gauge

With engine running, the fuel pressure gauge should register in the NORMAL range. If the gauge registers in the OUT range, service the fuel filter elements.

Draining Water And Sediment - All D342 and Early D353 Engines:

1. Close the fuel supply valve.

2. Open the fuel vent valve, located on top of the fuel filter housing.

FUEL VENT VALVE

3. Remove the fuel drain plug. Drain water and sediment from filter.

REMOVING FUEL FILTER HOUSING DRAIN PLUG - D342 Engine shown

REMOVING FUEL FILTER HOUSING DRAIN PLUG - D353 Engine shown

4. Install the drain plug.

5. Close fuel vent valve.

6. Prime the fuel system.

Cleaning Primary Filter Element

1. Stop the engine.

2. Close the diesel fuel supply line valve.

3. Loosen the nut on the cover and remove the case.

REMOVING PRIMARY FUEL FILTER

4. Remove the filter element. Clean the element and case in clean diesel fuel or solvent.

5. Inspect and install the upper and lower cover gaskets. Install new gaskets if necessary.

6. Install the cleaned filter element and case.

7. Open fuel supply line valve.

8. Prime the fuel system.

Installing New Final Fuel Filter Elements

D342 Engines:

1. Close the fuel supply line valve.

2. Open the fuel vent valve located on top of the fuel filter housing.

3. Remove the drain plug and drain the fuel filter housing.

4. Remove the filter housing cover.

REMOVING FILTER HOUSING COVER

5. Remove the filter elements.

6. Wipe sediment from inside the housings.

7. Install the drain plug.

8. Install the new elements.

9. Inspect and install the cover gasket. Install a new gasket if necessary.

10. Install the cover.

11. Open fuel supply line valve.

12. Prime the fuel system.

D343 and Later D353 Engines:

1. Close the fuel supply line valve.

2. Open the fuel vent valve located on top of the fuel filter housing.

3. Use a strap wrench to remove the filters. Be sure the old filter gasket does not remain attached to the filter base: Leaking between the new and old filter gaskets will result.

REMOVING FUEL FILTERS

4. Wipe the filter base.

WIRING FILTER BASE

5. Apply a few drops of clean fuel to the new filter gasket. Fill the new filter with clean diesel fuel.

6. Tighten the filter by hand until the gasket contacts the base; then tighten the filter 1/2 turn more.

7. Open the fuel supply line valve.

8. Prime the fuel system.

Earlier D353 Engines:

Check the governor oil level by observing the oil level in the sight gauge. Add oil as necessary through the filler hole on top of the governor. See the Lubrication and Maintenance Chart for proper oil to use.

1. Close the fuel supply line valve.

2. Open the fuel vent valve located on top of the fuel filter housing.

3. Remove the drain plug and drain the fuel filter housing.

4. Remove the fuel filter housing.

REMOVE FUEL FILTER HOUSING

5. Remove the filter elements.

6. Wipe sediment from inside the housing.

7. Install the drain plug.

8. Install new elements.

9. Inspect and install the cover gasket. Install a new gasket if necessary.

10. Install the filter housing.

11. Open fuel supply line valve.

12. Prime the fuel system.

Priming The Fuel System

1. Open the fuel supply line valve.

2. Move the governor control lever to the shut-off position.

3. Be sure the fuel vent valve, located on top of the fuel filter housing is open.

4. Turn and unlock the priming pump knob. Operate the pump until a solid stream of fuel flows from the drain tube.

OPERATING FUEL PRIMING PUMP

5. Turn the pump knob to the locked position.

6. Close the vent valve.

7. Start the engine.

If The Engine Runs Rough, Release Trapped Air From Fuel Lines

With the engine running:

1. Loosen a fuel line-loosen either the line nut at the fuel injection pump, or the line nut at the nozzle.

LOOSENING FUEL LINE NUT

2. Allow the fuel to spurt until the fuel stream is free of air bubbles.

3. Tighten the line nut. Proceed to the next fuel line and repeat the procedure.

4. Continue this procedure for all fuel lines.

Woodward UG8 Governor

Checking Governor Oil Level

1. Before starting the engine, the oil level should be at, or slightly above, the FULL mark.

2. With the engine running, the oil level must be between the ADD and FULL marks. Do not overfill. See the Lubrication and Mainenance Chart for proper oil.

CHECKING OIL LEVEL

Changing Governor Oil

1. Move the governor control lever to the shut-off position.

2. Shut off the fuel tank fuel supply valve.

3. Disconnect the ground cable from the battery.

Show/hide table

Be sure the engine cannot be started while work is being done. This is very important when the engine is equipped with an Automatic Start-Stop System.

4. Disconnect the governor linkage from the governor.

5. Disconnect the governor synchronizing motor wires.

DISCONNECT SYNCHRONIZING MOTOR

6. Remove the governor from the engine.

7. Remove the governor cover.

REMOVING GOVERNOR COVER

8. Turn the governor upside down and drain the oil.

9. Flush the governor with clean diesel fuel or solvent.

10. Install the governor on the engine.

11. Fill the governor, with clean oil, to the FULL mark on the sight gauge. See Lubrication and Maintenance Chart for proper oil.

12. Connect the governor linkage.

Show/hide table

Before starting the engine, check to be sure the governor linkage has been connected to the governor.

13. Connect the ground cable to the battery.

Bleeding Governor

1. Start the engine and allow the engine to reach normal operating temperature.

2. Loosen the nut on the side of the governor which holds the compensation adjusting pointer.

3. Manually move the pointer to the extreme upper position and tighten the nut. This will allow the governor to be purged of air.

SETTING POINTER AT UPPER POSITION

4. Remove the plug from the base of the governor.

5. Engage the shallow screwdriver slot and open the needle valve (turn counterclockwise) 3 or more turns.

OPENING NEEDLE VALVE

6. Allow the engine to surge for approximately 30 seconds.

7. Loosen the nut and move the compensation adjusting pointer to the extreme downward position. Tighten the nut.

8. Slowly close the needle valve (turn clockwise) until the surging stops.

9. It should now take less than one turn from this point to close the valve completely.

10. Open the valve to the same position where the surging had stopped.

11. Manually move the governor linkage to disturb the engine speed.

MANUALLY CHANGING ENGINE SPEED

If the engine speed stabilizes, and the needle valve requires 1/2 to 3/4 turn to close, the governor is properly adjusted. Install the base plug.

If the needle valve requires less than 3/8 turn to close, proceed with the following steps:

12. Raise the pointer two divisions on the pointer scale.

13. Engage the wide shallow slot and turn the needle valve counterclockwise 3 or more turns.

14. Allow the engine to surge approximately 30 seconds.

15. Gradually turn the needle valve clockwise until surging just stops.

16. Note the portion of a turn required to close the needle valve.

17. Open the valve exactly to the same position surging stopped.

18. Manually move the governor linkage to disturb the engine speed. The engine speed should stabilize with the needle valve opened 1/2 to 3/4 turn.

19. A valve opened less than 1/2 of a turn produces a slow response to load changes. A valve opened more than 3/4 of a turn produces excessive speed response to load change. If the engine does not stabilize between 1/2 to 3/4 turn open, raise the pointer two divisions and repeat steps 12 through 19.

20. When the engine speed stabilizes, install the base plug.